how would you justify the presence of 18 elements in the periodic table?
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Solution

I hope you mean 18 elements in the fifth period and not periodic tale!
When n = 5, l = 0, 1, 2, 3. The order in which the energy of the available orbitals 4d, 5s and 5p increases is 5s < 4d < 5p. The total number of orbitals available are 9. The maximum number of electrons that can be accommodated is 18; and therefore 18 elements are there in the 5th period.

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how would you justify the presence of 18 elements in the periodic table?answer it quickly in detail:

how would you justify the presence of 18 elements in the periodic table?
answer it quickly in detail: